Investments (Evaluation of Available-For-Sale Securities for OTTI and Evaluating Temporarily Impaired AFS Securities - Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Equity securities available-for-sale with gross unrealized loss of equal to or greater than stated percentage	20.00%
Fixed maturity securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in Gross Unrealized Temporary Loss	$ 2,900
Gross Unrealized Temporary Loss	1,700	4,600
Gross Unrealized Temporary Loss	1,035	1,220
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Change in Gross Unrealized Temporary Loss	(77)
Gross Unrealized Temporary Loss	40	117
Gross Unrealized Temporary Loss	35	48
Non-redeemable preferred stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Temporary Loss	35	47
20% or more [Member] | Six months or greater [Member] | Fixed maturity securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Temporary Loss	154
Number of Securities	58
20% or more [Member] | Six months or greater [Member] | Fixed maturity securities [Member] | Investment Grade [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Temporary Loss	82
Number of Securities	31
Percentage of gross unrealized loss	53.00%
20% or more [Member] | Six months or greater [Member] | Fixed maturity securities [Member] | Below Investment Grade [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Temporary Loss	72
Number of Securities	27
Percentage of gross unrealized loss	47.00%
20% or more [Member] | Twelve months or greater [Member] | Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities	7
Gross Unrealized Temporary Loss	$ 24
20% or more [Member] | Twelve months or greater [Member] | Non-redeemable preferred stock [Member] | Aaa/Aa/A [Member] | Financial Services Industry [Member]
Schedule of Available-for-sale Securities [Line Items]
Percentage of gross unrealized loss	25.00%